The technique of enhancing the functionality of polymeric materials through compositing microparticles is commonly utilized. For instance, studies have been conducted to manipulate heat transfer characteristics and stiffness while reducing weight through the incorporation of hollow particles. Polymeric materials hold particular significance as shock absorbers, and their dynamic behavior is crucial in defining their mechanical properties. The distinctive approach of dynamic X-ray CT enables the visualization of the internal behavior of polymeric materials under dynamic conditions, allowing the investigation of the relationship between the characteristics of functional materials and the internal behavior of these materials. In this study, dynamic viscoelasticity tests were performed on rubber composites containing particles of different shapes to evaluate the loss factor. Dynamic X-ray CT was also employed to evaluate the local strain within the material and to investigate if the dynamic behavior of the material varies based on the particle shape. Additionally, the generation of voids and their attributes were verified. As a result, it was established that both the amplitude distribution and the phase distribution of local strain changed as the loss factor increased. This result indicates that dynamic behavior alterations due to the incorporation of microparticles can be effectively captured using Dynamics Xray CT.
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